The Russian sailors, following a northern custom, skated in file, maintaining their rank by means of a long pole passed under their right arms, and in this way they described a trackway of singular regularity. The two children, blithe as birds, flitted about, now singly, now arm-in-arm, now joining the captain's party, now making a short peregrination by themselves, but always full of life and spirit. As for Ben Zoof, he was here, there, and everywhere, his imperturbable good temper ensuring him a smile of welcome whenever he appeared.

Thus coursing rapidly over the icy plain, the whole party had soon exceeded the line that made the horizon from the shore. First, the rocks of the coast were lost to view; then the white crests of the cliffs were no longer to be seen; and at last, the summit of the volcano, with its corona of vapor, was entirely out of sight. Occasionally the skaters were obliged to stop to recover their breath, but, fearful of frost-bite, they almost instantly resumed their exercise, and proceeded nearly as far as Gourbi Island before they thought about retracing their course.

But night was coming on, and the sun was already sinking in the east with the rapidity to which the residents on Gallia were by this time well accustomed. The sunset upon this contracted horizon was very remarkable. There was not a cloud nor a vapor to catch the tints of the declining beams; the surface of the ice did not, as a liquid sea would, reflect the last green ray of light; but the radiant orb, enlarged by the effect of refraction, its circumference sharply defined against the sky, sank abruptly, as though a trap had been opened in the ice for its reception.

Before the daylight ended. Captain Servadac had cautioned the party to collect themselves betimes into one group. "Unless you are sure of your whereabouts before dark," he said, "you will not find it after. We have come out like a party of skirmishers; let us go back in full force."

The night would be dark; their moon was in conjunction, and would not be seen; the stars would only give something of that "pale radiance" which the poet Corneille has described.

Immediately after sunset the torches were lighted, and the long series of flames, fanned by the rapid motion of their bearers, had much the appearance of an enormous fiery banner. An hour later, and the volcano appeared like a dim shadow on the horizon, the light from the crater shedding a lurid glare upon the surrounding gloom. In time the glow of the burning lava, reflected in the icy mirror, fell upon the troop of skaters, and cast their lengthened shadows grotesquely on the surface of the frozen sea.

Later still, half an hour or more afterwards, the torches were all but dying out. The shore was close at hand. All at once, Ben Zoof uttered a startled cry, and pointed with bewildered excitement towards the mountain. Involuntarily, one and all, they plowed their heels into the ice and came to a halt. Exclamations of surprise and horror burst from every lip. The volcano was extinguished! The stream of burning lava had suddenly ceased to flow!

Speechless with amazement, they stood still for some moments. There was not one of them that did not realize, more or less, how critical was their position. The sole source of the heat that had enabled them to brave the rigor of the cold had failed them! death, in the cruellest of all shapes, seemed staring them in the face-- death from cold! Meanwhile, the last torch had flickered out.

It was quite dark.

"Forward!" cried Servadac, firmly.

At the word of command they advanced to the shore; clambered with no little difficulty up the slippery rocks; gained the mouth of the gallery; groped their way into the common hall.

How dreary! how chill it seemed!

The fiery cataract no longer spread its glowing covering over the mouth of the grotto. Lieutenant Procope leaned through the aperture. The pool, hitherto kept fluid by its proximity to the lava, was already encrusted with a layer of ice.